How to check for valid mobile number with Twilio?

Been using some basic Twilio integrations to date but now want to use it also to validate for mobile numbers before invoking the sms api. Was wondering how to configure the Twilio API module with the required settings & parameters… and this with Australian mobile numbers so from what I understand, that will require adding in the GEO AU descriptor.

Thanks in advance if you have anything to point me in the right direction!